list = ["刻琴","胡桃","琴","公子","七七"]
for i in list:
    print(i,end = " ")
list1 = []
print("\n")
list1.append("信安导论")
list1.append("C语言")
for index,item in enumerate(list1):
    print(index,item)
list2 = [1,4,5,7,2,3,4]
list2[0] =9
list3 = sorted(list2)
print(list3)
list2.insert(0,3)
print(list2)
list2.remove(list2[0])
print(list2)
list2.reverse()
print(list2)


